单相光伏并网微型逆变器设计
|
摘要
设计一种适用于单个光伏组件的光伏并网微型逆变器,拓扑结构主要包括交错并联反激变换器、全桥反转电路和LC滤波电路。分析反激逆变器的工作原理和实现条件;采用数字信号控制器实现交错并联反激逆变器的软开关控制,可减小功率器件开关损耗,提高逆变器电能转换效率;改进的变步长扰动观察法,解决跟踪速度与控制精度之间的矛盾。通过样机实验验证设计的单级式光伏并网微型逆变器具有体积小、输出谐波含量低、功率密度高和电磁兼容性好等优点。
A photovoltaic( PV) grid-connected microinverter suitable for a single PV module and the topological structure mainly consists of interleaved flyback converter, full-bridge inversion circuit and LC filter circuit. The working principle and realization conditions of flyback converter is analyzed; the digital signal controller is adopted to realize soft switching control of the interleaved flyback inverter, reduce the switching loss of power devices and improve the conversion efficiency of electrical energy of inverter;the improved perturbation and observation( P & O)method based on variable step size is employed to resolve the conflict between tracking velocity and control precision. The prototype test is conducted to verify that the single-stage grid-connected PV microinverter has the following advantages: small volume, low output harmonic content, high power density and good electromagnetic compatibility(EMC), etc.
A photovoltaic( PV) grid-connected microinverter suitable for a single PV module and the topological structure mainly consists of interleaved flyback converter, full-bridge inversion circuit and LC filter circuit. The working principle and realization conditions of flyback converter is analyzed; the digital signal controller is adopted to realize soft switching control of the interleaved flyback inverter, reduce the switching loss of power devices and improve the conversion efficiency of electrical energy of inverter;the improved perturbation and observation( P & O)method based on variable step size is employed to resolve the conflict between tracking velocity and control precision. The prototype test is conducted to verify that the single-stage grid-connected PV microinverter has the following advantages: small volume, low output harmonic content, high power density and good electromagnetic compatibility(EMC), etc.
引文
[1]张兴,曹仁贤.太阳能光伏并网发电及其逆变控制[M].北京:机械工业出版社, 2010.
[2]汲德明.交错并联反激式光伏并网微型逆变器设计[D].太原:中北大学, 2017.
[3]王志彬.光伏微逆变器和优化器的研究[D].扬州:扬州大学, 2013.
[4]刘鉴民.太阳能利用原理·技术·工程[M].北京:电子工业出版社, 2010.
[5] Shimizu T, Wada K. Flyback-type single-phase utility interactive inverter with power pulsation decoupling on the DC input for an AC photovoltaic module system[J].IEEE Transactions on Power Electronics, 2006, 21(5):1264-1272.
[6]高海凌.并网型光伏级联微逆变系统研究[D].上海:上海电机学院, 2016.
[7] Do H L. A soft-switching DC/DC converter with high voltage gain[J]. IEEE Transactions on Power Electronics, 2010, 25(5):1193-1200.
[8]张锦吉,王小彬,毛行奎.交错反激微功率光伏并网逆变器的设计[J].电力电子技术, 2013, 47(4):43-45.
[9]古俊银,吴红飞,陈国成,等.软开关交错反激光伏并网逆变[J].中国电机工程学报, 2011, 36(1):40-45.
[10]吴红飞,古俊银,张君君,等.高效率高增益Boost-Flyback直流变换器[J].中国电机工程学报, 2011,31(24):40-45.
[11]张丽,方宇,赵齐齐,等.有源钳位反激式光伏并网微逆变器的效率分析[J].电测与仪表, 2015,52(2):43-48.
[12]赵庚申,王庆章,许盛之.最大功率点跟踪原理与实现方法的研究[J].太阳能学报, 2006, 27(10):997-1001.
[13] Esram T, Chapman P L. Comparison of photovoltaic array maximum power point tracking techniques[J]. IEEE Transactions on Energy Conversion,2007, 22(2):439-449.
[14]吴理博,赵争鸣,刘建政,等.单级式光伏并网逆变系统中的最大功率点跟踪算法稳定性研究[J].中国电机工程学报, 2006, 26(6):73-77.
[15]合肥阳光电源有限公司,北京市计科能源新技术开发公司,北京鉴衡认证中心,等. GB/T 30427-2013并网光伏发电专用逆变器技术要求和试验方法[S].北京:中国标准出版社, 2014.
[2]汲德明.交错并联反激式光伏并网微型逆变器设计[D].太原:中北大学, 2017.
[3]王志彬.光伏微逆变器和优化器的研究[D].扬州:扬州大学, 2013.
[4]刘鉴民.太阳能利用原理·技术·工程[M].北京:电子工业出版社, 2010.
[5] Shimizu T, Wada K. Flyback-type single-phase utility interactive inverter with power pulsation decoupling on the DC input for an AC photovoltaic module system[J].IEEE Transactions on Power Electronics, 2006, 21(5):1264-1272.
[6]高海凌.并网型光伏级联微逆变系统研究[D].上海:上海电机学院, 2016.
[7] Do H L. A soft-switching DC/DC converter with high voltage gain[J]. IEEE Transactions on Power Electronics, 2010, 25(5):1193-1200.
[8]张锦吉,王小彬,毛行奎.交错反激微功率光伏并网逆变器的设计[J].电力电子技术, 2013, 47(4):43-45.
[9]古俊银,吴红飞,陈国成,等.软开关交错反激光伏并网逆变[J].中国电机工程学报, 2011, 36(1):40-45.
[10]吴红飞,古俊银,张君君,等.高效率高增益Boost-Flyback直流变换器[J].中国电机工程学报, 2011,31(24):40-45.
[11]张丽,方宇,赵齐齐,等.有源钳位反激式光伏并网微逆变器的效率分析[J].电测与仪表, 2015,52(2):43-48.
[12]赵庚申,王庆章,许盛之.最大功率点跟踪原理与实现方法的研究[J].太阳能学报, 2006, 27(10):997-1001.
[13] Esram T, Chapman P L. Comparison of photovoltaic array maximum power point tracking techniques[J]. IEEE Transactions on Energy Conversion,2007, 22(2):439-449.
[14]吴理博,赵争鸣,刘建政,等.单级式光伏并网逆变系统中的最大功率点跟踪算法稳定性研究[J].中国电机工程学报, 2006, 26(6):73-77.
[15]合肥阳光电源有限公司,北京市计科能源新技术开发公司,北京鉴衡认证中心,等. GB/T 30427-2013并网光伏发电专用逆变器技术要求和试验方法[S].北京:中国标准出版社, 2014.